Construction Of A Simulation Test Environment For Radar Waveform Countermeasures Based On Virtual Instruments

Radar anti-jamming in the complex electromagnetic environment is usually a dynamic process,which makes the development of corresponding test verification systems more and more difficult and complicated.Traditional test equipment has been difficult to meet the needs of testing and verifying designed radar waveforms and processing algorithms.This article is aimed at the problem of testing and verifying platform design in the research of radar using waveform resources to counter the main lobe Digital Radio Frequency Memory(DRFM)deception jamming,constructing a virtual instrument-based radar waveform countermeasure simulation test environment,which can realize the semi-physical simulation test of the waveform countermeasure process.The simulation test environment mainly includes a radar system that can use waveform resources flexibly and a target and jamming simulation system that adopts the DRFM architecture.The hardware of environment is based on NI’s commercial off-the-shelf PXI system,which can realize the simulation of dynamic waveform countermeasures.The research content and innovative work of this article mainly include the following aspects:(1)The complex modulation pulse train is abstractly described as a waveform matrix with the coherent processing interval as the update period.A method for generating complex waveform that selection and modulation are separated and a visual representation named phase space quick response code is proposed.And an FPGA-based general-purpose modulation engine for radar waveforms is designed based on it,which can realize the decoupling of waveform generation and waveform pattern,waveform optimization/selection and waveform generation decoupling.(2)A control module that can flexibly simulate a variety of forwarding jamming and targets is designed based on the DRFM architecture.Based on this control module and virtual instruments,a modular,expandable,lightweight and portable target jamming simulation system is designed.This design can generate a variety of forward jamming signals based on radar echoes,which include interrupted sampling repeater jamming,and forwarding delay is not more than 16 ns.The design of this article is lighter and more flexible in structure compared with the existing solutions.The functions of the system can be quickly defined and expanded through reconfigurable software,and a variety of different test requirements can be completed by replacement and expansion of boards.(3)Integrating the simulation test environment,and completing the design and implementation of the environment’s software and hardware structure and functions,then testing the integrated environment.The test proved that the environment has the ability to test dynamic waveforms,and can be quickly and flexibly reconstructed.The environment could complete a variety of complex test verification tasks and provide a test verification platform for the research of waveform countermeasures related theory and technology.